Efficient green and red up-conversion emissions in Er/Yb co-doped TiO 2  nanopowders prepared by hydrothermal-assisted sol–gel process

Salhi, Rached; Deschanvres, Jean‐Luc

doi:10.1016/j.jlumin.2016.03.011

Cited by 52 publications

(18 citation statements)

References 57 publications

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“…It corresponds to the partial decomposition of titanium dioxide. The recorded mass loss could be related by the evaporation of absorbed water which corresponds to a signi cant endothermic effect (Salhi and Deschanvres, 2016). It is worth ion to mention that the excellent stability of TiO 2 anatase phase from 288°C to 800°C.…”

Section: Tio 2 Nanopowder Studymentioning

confidence: 93%

Impact of Spherical Anatase TiO2 Nanoparticles on Thermal Properties of Polypropylene Resin

Bendaoued

Messaoud

Harzallah

et al. 2021

Preprint

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Ceramics nanometric reinforced polymer composite is a significant material for catalysis, solar cells, production of hydrogen and energy applications, etc. In order to take benefit from the interesting mechanical properties and thermal stability of TiO2, these ceramic nanomaterials was synthesized by the Sol-Gel process in attempt to study the thermal stability, structure, and morphology of the resulting nanoparticles powders. The obtained results revealed that, the sphere is composed of 20-30 nm nanoparticles with excellent thermal stability of nano-TiO2. This work focused on the thermal characterization and the study of nanocomposite xWt. %TiO2/PP (x=0, 2.5, 5, 7.5 mol%). In this study, the obtained results revealed that the molar ratio of TiO2 influences the final thermal stability and degree of crystallinity of the composite. It was found that the use of TiO2 seems to be an effective and very promising way to increase the thermal properties of the resulting composite. The greatest degree of crystallinity (54.80%) and thermal degradation stability are obtained for composite reinforced by 7.5Wt. %TiO2.

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Section: Tio 2 Nanopowder Studymentioning

confidence: 93%

Impact of Spherical Anatase TiO2 Nanoparticles on Thermal Properties of Polypropylene Resin

Bendaoued

Messaoud

Harzallah

et al. 2021

Preprint

Self Cite

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“…TiO 2 exhibited faster electron transfer, lower electron–hole recombination rate compared with those in undoped TiO 2 sample by doping with ytterbium ion (Yb 3+ ) and Er 3+ . Moreover, Yb 3+ possesses large cross‐section absorption for infrared (IR) light resulting in high efficiency for absorbed energy‐transfer to Er 3+ . As reported by Liu et al ., Er 3+ could transform IR light which was absorbed by Bi 5 O 7 I into visible light …”

Section: Introductionmentioning

confidence: 97%

“…TiO 2 crystallizes to form anatase, rutile, and brookite phases. Among them, anatase TiO 2 crystal, which exhibits great features, such as photostability, chemical stability, sophisticated shape and low‐cost material, is considered as an excellent photonic material candidate to be applied in solar energy systems . However, the band gap of TiO 2 is 3.2 eV which limits its effective applications.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity of Yb, Er, Ce‐codoped TiO₂ for degradation of Rhodamine B and 4‐chlorophenol

Paeng

Phượng

Dao

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Photodegradation through an advanced oxidation process gives promising prospects for environmental protection. Although titanium dioxide (TiO2) is considered as an excellent photonic material candidate, however, the band gap of TiO2 is 3.2 eV which limits its effective applications. Various approaches have been developed for enhancing the utilization of TiO2 such as coupling with other narrow bandgap semiconductors and metal ions. We developed a novel ytterbium (Yb), erbium (Er), cerium (Ce)‐codoped TiO2 material as a high‐performance photocatalyst for efficient degradation of Rhodamine B (RhB) and 4‐chlorophenol (4‐CP) by hydrothermal technique. Yb, Er, and Ce ions served as electron collectors for the interfacial electrons transferred from TiO2, thus enhancing the separation of the photo‐induced electron–hole pairs. RESULTS The photocatalytic activity of the prepared TiO2–Er0.15Yb0.15Ce0.14 sample is higher than those of undoped TiO2, TiO2–Ce0.3 and TiO2–Er0.15Yb0.15 samples under optimal condition. Our developed catalyst degraded 98% of 0.04 mM RhB and 95% of 0.6 mM 4‐CP under white light irradiation for 60 and 240 min, respectively. Moreover, a probable photodegradation mechanism is proposed. CONCLUSION TiO2–Er0.15Yb0.15Ce0.14 with high photocatalytic degradation efficiency under white light irradiation was synthesized by a hydrothermal method. Yb3+, Er3+, Ce4+ played a role as photo‐induced electron collectors to suppress the recombination of photo‐induced electron–hole pairs. The synthesized material has a high potential as an efficient photocatalyst for toxic pollutants in aqueous media. © 2019 Society of Chemical Industry

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“…4), 5) The luminescent center Er 3+ doped UC phosphors generally exhibit strong green and weak red emission, and green emission is further enhanced with increasing con-centrations of luminescent center Er 3+ and sensitizer Yb 3+ . For example, YVO 4 :Er, Yb, 6) CaWO 4 :Er, Yb, Li, 7) La 2 O 3 : Er, Yb, 8) TiO 2 :Er, Yb, 9) BaTiO 3 :Er, Yb, 10) and so on. YVO 4 :Er, Yb nanocrystals are reported to have an UC emission that is not very sensitive to non-radiative relaxations, and leading to a high green-to-red emission ratio about 6.3.…”

Section: Introductionmentioning

confidence: 99%

Examination on red emission of up-conversion phosphors with Bi-containing host materials

Nagai

Shan

Tezuka

2019

J. Ceram. Soc. Japan

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The luminescent center Er 3+ doped upconversion (UC) phosphors generally exhibit strong green and weak red emission, however, some UC phosphors with Bi-containing host materials exhibit an intense red emission, or the emission color can change from green to red as the Er 3+ , Yb 3+ concentration increases. This paper examined the relationship between the red UC emission and Bi-containing host materials by comparing the UC emission colors of host materials containing or not containing Bi with different or identical crystal structures. Furthermore, novel UC phosphors Bi 2 Ti 4 O 11 :xEr, yYb and Bi 2 Sn 2 O 7 :xEr, yYb were also synthesized by solid-state reaction method to certify those facts. These UC phosphors exhibit intense red emission with increasing Er, Yb concentrations in the same way as the reported UC phosphors with Bi-containing host materials. Based on the experimental results, it can be thought that energy transfer exists between Bi 3+ and luminescence center Er 3+ , and inferred that non-radiative relaxation (energy-loss) is more easily to occur. Therefore, Er 3+ doped UC phosphors with Bi-containing host materials tend to exhibit lower energy red emission than green emission.

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Efficient green and red up-conversion emissions in Er/Yb co-doped TiO 2 nanopowders prepared by hydrothermal-assisted sol–gel process

Cited by 52 publications

References 57 publications

Impact of Spherical Anatase TiO2 Nanoparticles on Thermal Properties of Polypropylene Resin

Impact of Spherical Anatase TiO2 Nanoparticles on Thermal Properties of Polypropylene Resin

Photocatalytic activity of Yb, Er, Ce‐codoped TiO₂ for degradation of Rhodamine B and 4‐chlorophenol

Examination on red emission of up-conversion phosphors with Bi-containing host materials

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Efficient green and red up-conversion emissions in Er/Yb co-doped TiO 2 nanopowders prepared by hydrothermal-assisted sol–gel process

Cited by 52 publications

References 57 publications

Impact of Spherical Anatase TiO2 Nanoparticles on Thermal Properties of Polypropylene Resin

Impact of Spherical Anatase TiO2 Nanoparticles on Thermal Properties of Polypropylene Resin

Photocatalytic activity of Yb, Er, Ce‐codoped TiO2 for degradation of Rhodamine B and 4‐chlorophenol

Examination on red emission of up-conversion phosphors with Bi-containing host materials

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Photocatalytic activity of Yb, Er, Ce‐codoped TiO₂ for degradation of Rhodamine B and 4‐chlorophenol